surgical operation, surgical procedure, surgical process, surgery, operation - a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; they will schedule the operation as soon as an operating room is available; he died while undergoing surgery.
A quarter mile is, by definition, a fourth of a mile. It is 1,320 feet or 402.3 meters. On a standard-sized Olympic track, it is a little more than a single lap.
A Nautical Mile is 6,080 feet. A statute mile (regular mile) is 5,280 feet. The nautical mile was extended in order to have an equal number of parts measured around the globe to accomodate celestial navigation.